Re: GECKOS 201

Hi JAn,

I do agree that the 470uF are worth the little effort to install. At
about 4 for a dollar, they are also worth their weight in gold.

My understanding was that the line lenght between the 201 and the
power supply allowed the main filter caps to handle the kickback that
was not handled on board the Gecko's. but, if the length was more
than 18 inches, the 470's are required.

To me this means that the little bit of additional filtering adds
lots of protection. If your main caps were well under size, say, one
third the recomended size, are you losing any of that main filter and
therefore require the 470 ?

In my case, I am using an old PC tower as the box for the power
supply. I mounted the Gecko's on hard disk sleds that fit in the
5.25 drive bays. put the fuse (instantly, 470's are required when
using a fuse) on the drive sled front. This also means the wiring
goes from the power supply along the case, down to the sled, then
with enough left to allow the sled to be pulled to the front.

Running 4 NEMA34's, single stack, series at 2.25amps so I can get by
without a heat sink, but I mounted each one on a 1/4 plate of
aluminum and allow the air entering the box to pass over the Gecko's.

Dave

--- In CAD_CAM_EDM_DRO@y..., JanRwl@A... wrote:
> In a message dated 11/27/2002 3:24:35 PM Central Standard Time,
> davemucha@j... writes:
>
> > My question would be if the recommended 470uF cap on the power
> > connection at the Gecko's is now REQUIRED ? if you are going less
> > than the book values?
>
> Dave: This 470 uF cap. (per drive) is necessary ONLY if your DC
wires to the
> "main filter cap" (the 10,000 to 40,000 cap you are talking about)
are longer
> than, say, six inches, and are skinnier than they should be
(smaller than,
> say, #18). But they are a GOOD idea, ANYway, and will probably
prevent some
> "impossible to find" problems! These 470 uF caps should NOT be
thought of
> as "DC Filter-caps" but "traps" for hard-to-qualify nasties.
Though they DO
> also provide SOME 60 Hz. ripple-filtering, but not much.
>
> READ the "white papers" that come with the G201/210! All that is
adequately
> explained in those pages.
>
> Jan Rowland
>
>
> [Non-text portions of this message have been removed]